Flutter学習の道-テスト(ユニットテスト、Widgetテスト、統合テスト)

Flutter学習の道-テスト(ユニットテスト、Widgetテスト、統合テスト)

Flutterのテストについて

ユニットテスト

dev_dependencies:
  test: 

flutter_road_test/
  lib/
    counter.dart
  test/
    counter_test.dart

class Counter {
  int value = 0;

  void increment() => value++;

  void decrement() => value--;
}

// Import the test package and Counter class
import 'package:test/test.dart';
import 'package:counter_app/counter.dart';

void main() {
  test('Counter value should be incremented', () {
    final counter = Counter();

    counter.increment();

    expect(counter.value, 1);
  });
}

import 'package:test/test.dart';
import 'package:counter_app/counter.dart';

void main() {
  group('Counter', () {
    test('value should start at 0', () {
      expect(Counter().value, 0);
    });

    test('value should be incremented', () {
      final counter = Counter();

      counter.increment();

      expect(counter.value, 1);
    });

    test('value should be decremented', () {
      final counter = Counter();

      counter.decrement();

      expect(counter.value, -1);
    });
  });
}

flutter test test/counter_test.dart

Widgetテスト

dev_dependencies:
  flutter_test:
    sdk: flutter

class MyWidget extends StatelessWidget {
  final String title;
  final String message;

  const MyWidget({
    Key key,
    @required this.title,
    @required this.message,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      home: Scaffold(
        appBar: AppBar(
          title: Text(title),
        ),
        body: Center(
          child: Text(message),
        ),
      ),
    );
  }
}

void main() {
  // with Widgets in the test environment.
  testWidgets('MyWidget has a title and message', (WidgetTester tester) async {
    // Create the Widget tell the tester to build it
    await tester.pumpWidget(MyWidget(title: 'T', message: 'M'));

    // Create our Finders
    final titleFinder = find.text('T');
    final messageFinder = find.text('M');

    // Use the `findsOneWidget` matcher provided by flutter_test to verify our
    // Text Widgets appear exactly once in the Widget tree
    expect(titleFinder, findsOneWidget);
    expect(messageFinder, findsOneWidget);
  });
}

findsOneWidget   Widget
findsNothing   Widget
findsWidgets   Widget
findsNWidgets   N   Widget

  API,  :
expect(find.text('Save'), findsNWidgets(2));

統合テスト

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Counter App',
      home: MyHomePage(title: 'Counter App Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              // Provide a Key to this specific Text Widget. This allows us
              // to identify this specific Widget from inside our test suite and
              // read the text.
              key: Key('counter'),
              style: Theme.of(context).textTheme.display1,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        // Provide a Key to this the button. This allows us to find this
        // specific button and tap it inside the test suite.
        key: Key('increment'),
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}

dev_dependencies:
  flutter_driver:
    sdk: flutter
  test: any

flutter_road_test/
  lib/
    main.dart
  test_driver/
    app.dart
    app_test.dart

import 'package:flutter_driver/driver_extension.dart';
import 'package:flutter_road_test/main.dart' as app;

void main() {
  // This line enables the extension
  enableFlutterDriverExtension();

  // Call the `main()` function of your app or call `runApp` with any widget you
  // are interested in testing.
  app.main();
}

// Imports the Flutter Driver API
import 'package:flutter_driver/flutter_driver.dart';
import 'package:test/test.dart';

void main() {
  group('Counter App', () {
    //   Finders   Widgets
    final counterTextFinder = find.byValueKey('counter');
    final buttonFinder = find.byValueKey('increment');

    FlutterDriver driver;

    //   Flutter driver 
    setUpAll(() async {
      driver = await FlutterDriver.connect();
    });

    //  
    tearDownAll(() async {
      if (driver != null) {
        driver.close();
      }
    });

    test('starts at 0', () async {
      //   `driver.getText`   counter   0
      expect(await driver.getText(counterTextFinder), "0");
    });

    test('increments the counter', () async {
      //  ， 
      await driver.tap(buttonFinder);

      //  ，  1
      expect(await driver.getText(counterTextFinder), "1");
    });
  });
}

flutter drive --target=test_driver/app.dart

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